github/workflows: remove coverage workflow

[ivanvc]

This workflow has already been migrated to the Prow infrastructure.

To have the Codecov bot publish the coverage report from the given pull request, it must be invoked using some additional arguments.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[ivanvc]

/test all

[ivanvc]

/test pull-etcd-coverage-report

[ivanvc]

/test pull-etcd-coverage-report

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.50%. Comparing base (14cf669) to head (4ce48ce).
Report is 63 commits behind head on main.

Additional details and impacted files

see 56 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19424      +/-   ##
==========================================
+ Coverage   68.95%   69.50%   +0.54%     
==========================================
  Files         420      406      -14     
  Lines       35753    35432     -321     
==========================================
- Hits        24655    24628      -27     
+ Misses       9677     9388     -289     
+ Partials     1421     1416       -5     

---

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ivanvc

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• OWNERS [ahrtr]

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[ahrtr]

/retest